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What is the sum of all the integers from 1 to 80, inclusive?

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Math Expert
Joined: 02 Sep 2009
Posts: 58464
What is the sum of all the integers from 1 to 80, inclusive?  [#permalink]

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31 Aug 2018, 00:03
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Difficulty:

5% (low)

Question Stats:

86% (00:50) correct 14% (00:59) wrong based on 60 sessions

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What is the sum of all the integers from 1 to 80, inclusive?

(A) 3,200
(B) 3,210
(C) 3,230
(D) 3,240
(E) 3,450

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Re: What is the sum of all the integers from 1 to 80, inclusive?  [#permalink]

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31 Aug 2018, 00:13
Sum of the integers from 1-80 is given by n(n+1)/2.

N=80

Sum = 80*81/2 = 40*81 = 3240.

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What is the sum of all the integers from 1 to 80, inclusive?  [#permalink]

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31 Aug 2018, 00:45
Bunuel wrote:
What is the sum of all the integers from 1 to 80, inclusive?

(A) 3,200
(B) 3,210
(C) 3,230
(D) 3,240
(E) 3,450

sum of 1st n terms = $$\frac{n(n+1)}{2}$$
$$\frac{80*81}{2}$$ = 3240
D
What is the sum of all the integers from 1 to 80, inclusive?   [#permalink] 31 Aug 2018, 00:45
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